What is the fixed point DSP processor?

What is the fixed point DSP processor?

Fixed-point DSPs are designed to represent and manipulate integers – positive and negative whole numbers – via a minimum of 16 bits, yielding up to 65,536 possible bit patterns (216).

What is a fixed point system?

In computing, fixed-point refers to a method of representing fractional (non-integer) numbers by storing a fixed number of digits of their fractional part. In the fixed-point representation, the fraction is often expressed in the same number base as the integer part, but using negative powers of the base b.

What are the advantages of fixed point processor?

Benefits of Fixed-Point Hardware

• Size and Power Consumption — The logic circuits of fixed-point hardware are much less complicated than those of floating-point hardware.
• Memory Usage and Speed — In general fixed-point calculations require less memory and less processor time to perform.

Is fixed point faster than floating-point?

Fixed point math, independent of processor speed, is easier to code with and faster than floating point math. Fixed point is adequate unless you know that you will be dealing with higher numbers than the fixed-point unit can handle. A floating-point number doesn’t have a fixed number of bits before and after a decimal.

Which one is fixed point DSPs?

Fixed point DSPs usually represent each number with a minimum of 16 bits, although a different length can be used. For instance, Motorola manufactures a family of fixed point DSPs that use 24 bits. There are four common ways that these 216 = 65536 possible bit patterns can represent a number.

How do you convert to fixed point?

Converting from a floating-point value to a fixed-point value involves the following steps:

1. Multiply the float by 2^(number of fractional bits for the type), eg.
2. Round the result (just add 0.5) if necessary, and floor it (or cast to an integer type) leaving an integer value.
3. Assign this value into the fixed-point type.

Is fixed point faster than floating point?

What are limitations of fixed point numbers?

Disadvantages: It is easy for a arithmetic operation to produce a “overflow” or “underflow”. A fixed point number has a limited integer range. It is not possible to represent very large and verey small numbers with the same representation.

Is fixed-point arithmetic faster?

Fixed point generally doesn’t provide much of an advantage in speed though, because of its limited representation range: how many bits would you need to represent 1.7E+/-308 with 15 digits of precision, the same as a 64-bit double? If my calculations are correct, you’d need somewhere around 2020 bits.

What are the advantages of floating point representation?

Floating-point numbers have two advantages over integers. First, they can represent values between integers. Second, because of the scaling factor, they can represent a much greater range of values.

Which is an application specific integrated circuit ( ASIC )?

Application-specific standard product (ASSP) chips are intermediate between ASICs and industry standard integrated circuits like the 7400 series or the 4000 series. ASIC chips are typically fabricated using metal-oxide-semiconductor (MOS) technology, as MOS integrated circuit chips.

What is the hardware description language for ASICs?

Designers of digital ASICs often use a hardware description language (HDL), such as Verilog or VHDL, to describe the functionality of ASICs.

Why are ASICS not reprogrammable or semi custom?

Since ASICs are semi- or full-custom designs, they require higher development costs and often reach into the millions during design and implementation stages. In addition, ASICs are non-reprogrammable once they are produced; hence, changes in the design incur additional cost.

Can a fixed point number be a floating point number?

Binary fixed-point numbers can represent fractional powers of two exactly, but, like binary floating-point numbers, cannot exactly represent fractional powers of ten. If exact fractional powers of ten are desired, then a decimal format should be used.